Rotary binder

Abstract

This invention discloses a rotary binder for applying gummed tape to continuous forms having perforated margins wherein two heads are mounted above and below the forms, and which heads rotate in synchronism in the same direction as a roller advancing the forms. The heads carry cooperating mechanisms having a trajectory equal to an integral multiple of the pitch of the perforation and which affix, cut and tear off a strip from a roll of gummed tape. The binder also includes mechanisms for unwinding the roll before forming the strip; mechanisms for stopping the roll before detaching the strip; mechanisms for causing the front of the strip to pass through one of the perforations and mechanisms for bending the tip of the strip and securing it to the bottom sheet of the form.

I claim: 
     
       1. A rotating binder for binding continuous sheets of a form having perforated margins comprising: rotary means for moving said form along a given axial direction;   a rotary spool of gummed tape;   a first head mounted rotatably above said form and a second head mounted rotatably below said form;   said first and said second heads rotating in said axial direction in synchronism with one another and with said rotary means;   said heads carrying means having a trajectory whose development on said form is equal to an integral multiple of the pitch of the perforation and adapted to fix, cut and tear off a strip of tape obtained from said spool;   means for unwinding said spool before the formation of said strip;   means for stopping said tape before the detachment of said strip;   means for causing the front portion of said strip to pass through one of said perforations in the margin of the form; and   means for bending a tip of said strip and fixing it to the bottom sheet of said form.   
     
     
       2. Rotating binder according to claim 1, wherein: said gummed tape has a width equal to that of the binding strip.   
     
     
       3. Rotating binder according to claim 1 or 2, wherein: the first of said heads has a rim, a presser eccentrically secured to said rim and having a curved active surface tangential to said form;   a punch eccentrically secured to the back of said rim;   said punch having a straight tip perpendicular to said strip; and   screw means being provided for adjusting the positions of said presser and of said punch in relation to said rim.   
     
     
       4. Rotating binder according to claim 1, wherein: said second head has a rim;   said rim mounting a radially slidable, spring-urged presser thereon;   said presser having a curved surface tangential to said form;   said surface being locatable periodically opposite said punch on said first head.   
     
     
       5. Rotating binder according to claim 4, wherein: said pressers rotate at a peripheral speed equal to the speed of advance of the form.   
     
     
       6. Rotating binder according to claim 1, including shafts extending over the entire width of said form for supporting said heads of two operative units placed at two perforated margins of said form and being interlocked with a single control of the rotational motion. 
     
     
       7. Rotating binder according to claim 1, wherein said means for unwinding said spool includes: a lever oscillatably mounted on a pin;   a pulley at one end of said lever;   said lever being operatively connected with return spring means and with screw means;   said first head having a first cam thereon;   said first cam being interlocked with said lever and with said screw means.   
     
     
       8. A rotating binder according to claim 7, wherein said means for stopping said tape includes: a lever oscillatably mounted on said pin;   said lever having a foot at one end and being adapted to cooperate with a sill on which said form moves;   said foot being positioned to intercept said tape near said first head and said form;   said lever being operatively connected with return spring means and screw means;   said first head having a second cam thereon; and   said lever being interlocked with said lever and with said screw means.   
     
     
       9. Rotating binder according to claim 1 including pressers rotating at a per pherel speed equal to the speed of advance of the form.